Geomagnetic data 1972  indices, rapid variations, special intervals 
edited by D. Van Sabben  
 - Paris  International Union of Geodesy and Geophysics   1973 
 - xii+89p. 
 - International Association of Geomagnetism and Aeronomy Bulletin; No. 32c .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Iaga Bulletin No.32cIaga Bulletin-dataIaga IndicesIugg
<br/><br/><label>Universal Decimal Class. No.: </label>550.38  / IAGA